A5100319034- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Quantum and electron transport phenomena
- Magnetic and transport properties of perovskites and related materials
- 2D Materials and Applications
- Iron-based superconductors research
- Graphene research and applications
- Electronic and Structural Properties of Oxides
- Topological Materials and Phenomena
- Machine Learning in Materials Science
- Cold Atom Physics and Bose-Einstein Condensates
- Spectroscopy and Quantum Chemical Studies
- Organic and Molecular Conductors Research
- Particle accelerators and beam dynamics
- X-ray Diffraction in Crystallography
- Quantum Information and Cryptography
- Particle Accelerators and Free-Electron Lasers
- Crystallography and Radiation Phenomena
- Quantum, superfluid, helium dynamics
- Magnetic properties of thin films
- Rare-earth and actinide compounds
- Advanced Chemical Physics Studies
- Superconducting Materials and Applications
- Inorganic Chemistry and Materials
- Smart Grid Energy Management
Emory University
2022-2025
Clemson University
2020-2024
University of Hong Kong
2018-2024
Tsinghua University
2016-2024
Fudan University
2022-2024
State Key Laboratory of Surface Physics
2022-2024
University of Science and Technology of China
2012-2024
Shaanxi University of Science and Technology
2024
Tsinghua–Berkeley Shenzhen Institute
2024
Second Hospital of Liaohe Oilfield
2024
In the cuprates, one-dimensional chain compounds provide a unique opportunity to understand microscopic physics due availability of reliable theories. However, progress has been limited by inability controllably dope these materials. Here, we report synthesis and spectroscopic analysis cuprate Ba$_{2-x}$Sr$_x$CuO$_{3+\delta}$ over wide range hole doping. Our angle-resolved photoemission experiments reveal doping evolution holon spinon branches. We identify prominent folding branch whose...
The competition between antiferromagnetism and hole motion in two-dimensional Mott insulators lies at the heart of a doping-dependent transition from an anomalous metal to conventional Fermi liquid. Condensed matter experiments suggest charge carriers change their nature within this crossover, but complete understanding remains elusive. We observe such crossover Fermi-Hubbard systems on cold-atom quantum simulator reveal transformation multi-point correlations spins holes upon increasing...
Neutron and X-ray scattering represent two state-of-the-art materials characterization techniques that measure materials' structural dynamical properties with high precision. These play critical roles in understanding a wide variety of systems, from catalysis to polymers, nanomaterials macromolecules, energy quantum materials. In recent years, neutron have received significant boost due the development increased application machine learning problems. This article reviews progress applying...
The excitonic insulator is an electronically driven phase of matter that emerges upon the spontaneous formation and Bose condensation excitons. Detecting this exotic order in candidate materials a subject paramount importance, as size gap band structure establishes potential collective state for superfluid energy transport. However, identification real solids hindered by coexistence structural parameter with same symmetry order. Only few are currently believed to host dominant phase, Ta 2...
Recent experiment has unveiled an anomalously strong electron-electron attraction in one-dimensional copper-oxide chain Ba$_{2-x}$Sr$_x$CuO$_{3+\delta}$. While the near-neighbor electron $V$ extended Hubbard been examined recently, its effect model beyond remains unclear. We report a density-matrix renormalization group study of on long four-leg cylinders square lattice. find that can notably enhance long-distance superconducting correlations while simultaneously suppressing...
Abstract This paper presents a roadmap to the application of AI techniques and big data (BD) for different modelling, design, monitoring, manufacturing operation purposes superconducting applications. To help superconductivity researchers, engineers, manufacturers understand viability using BD as future solutions challenges in superconductivity, series short articles are presented outline some potential applications solutions. These futuristic routes their materials/technologies considered...
Strongly correlated materials respond sensitively to external perturbations such as strain, pressure, and doping. In the recently discovered superconducting infinite-layer nickelates, transition temperature can be enhanced via only ~ 1% compressive strain-tuning with root of enhancement still being elusive. Using resonant inelastic x-ray scattering (RIXS), we investigate magnetic excitations in PrNiO
Despite significant progress in resonant inelastic x-ray scattering (RIXS) experiments on cuprates at the Cu L-edge, a theoretical understanding of cross-section remains incomplete terms elementary excitations and connection to both charge spin structure factors. Here we use state-of-the-art, unbiased numerical calculations study low energy probed by RIXS undoped doped Hubbard model relevant cuprates. The results highlight importance geometry, particular incident scattered photon...
With symbolic computation, some lump solutions are presented to a (3+1)-dimensional nonlinear evolution equation by searching the positive quadratic function from Hirota bilinear form of equation. The contains six free parameters, four which satisfy two determinant conditions guaranteeing analyticity and rational localization solutions, while others free. Then, combining with exponential function, interaction between stripe solitons on basis conditions. Furthermore, we extend this method...
The authors systematically characterize the three-orbital Hubbard model using state-of-the-art determinant quantum Monte Carlo (DQMC) simulations with parameters relevant to cuprate high-temperature superconductors. DQMC results agree well those from experiments, such as photoemission, and enable identification of orbital content in bands. A comparison exact diagonalization cluster perturbation theory elucidates how these different numerical techniques complement one another produce a more...
van der Waals heterostructures, vertical stacks of layered materials, offer new opportunities for novel quantum phenomena which are absent in their constituent components. Here we report the emergence polaron quasiparticles at interface graphene/hexagonal boron nitride (h-BN) heterostructures. Using nanospot angle-resolved photoemission spectroscopy, observe zone-corner replicas h-BN valence band maxima, with energy spacing coincident highest phonon heterostructure, an indication Fröhlich...
Ultrafast lasers are an increasingly important tool to control and stabilize emergent phases in quantum materials. Among a variety of possible excitation protocols, particularly intriguing route is the direct light engineering microscopic electronic parameters, such as electron hopping local Coulomb repulsion (Hubbard U). In this work, we use time-resolved x-ray absorption spectroscopy demonstrate light-induced renormalization Hubbard U cuprate superconductor, La1.905Ba0.095CuO4. We show...
In Kagome metal CsV$_3$Sb$_5$, multiple intertwined orders are accompanied by both electronic and structural instabilities. These exotic have attracted much recent attention, but their origins remain elusive. The newly discovered CsTi$_3$Bi$_5$ is a Ti-based to parallel CsV$_3$Sb$_5$. Here, we report angle-resolved photoemission experiments first-principles calculations on pristine Cs-doped samples. Our results reveal that the van Hove singularity (vHS) in can be tuned large energy range...
We study the square-lattice extended Hubbard model with on-site $U$ and nearest-neighbor $V$ interactions by exact diagonalization. show that nonequilibrium quench dynamics can help determine equilibrium phase transition boundaries, which agree calculations of fidelity metric, dynamical structure factor, correlation function. At half filling, diagrams in strong-coupling regime include spin density wave ${d}_{{x}^{2}\ensuremath{-}{y}^{2}}$-wave superconductivity at large positive $U$, charge...
Abstract The unusual properties of superconductivity in magic-angle twisted bilayer graphene (MATBG) have sparked considerable research interest 1–13 . However, despite the dedication intensive experimental efforts and proposal several possible pairing mechanisms 14–24 , origin its remains elusive. Here, by utilizing angle-resolved photoemission spectroscopy with micrometre spatial resolution, we reveal flat-band replicas superconducting MATBG, where MATBG is unaligned hexagonal boron...
Characterizing entanglement in quantum materials is crucial for advancing next-generation technologies. Despite recent strides witnessing magnetic with distinguishable spin modes, quantifying systems formed by indistinguishable electrons remains a formidable challenge. To solve this problem, we introduce method to extract various four-fermion correlations analyzing the nonlinearity resonant inelastic x-ray scattering spectra. These constitute primary components of cumulant two-particle...
Using Cu-${L}_{3}$ edge resonant inelastic x-ray scattering (RIXS) we measured the dispersion and damping of spin excitations (magnons paramagnons) in high-${T}_{\mathrm{c}}$ superconductor ${(\text{Bi,Pb})}_{2}{(\text{Sr,La})}_{2}{\mathrm{CuO}}_{6+\ensuremath{\delta}}$ (Bi2201), for a large doping range across phase diagram $(0.03\ensuremath{\lesssim}p\ensuremath{\lesssim}0.21)$. Selected measurements with full polarization analysis unambiguously demonstrate spin-flip character these...
Significance Fermi surface (FS) topology is a fundamental property of metals and superconductors. In electron-doped cuprate Nd 2− x Ce CuO 4 , an unexpected FS reconstruction has been observed in optimal- overdoped regime ( = 0.15 − 0.17) by quantum oscillation measurements (QOM). This puzzling because neutron scattering suggests that the antiferromagnetic long-range order, which believed to reconstruct FS, vanishes before 0.14. Here, we report angle-resolved photoemission evidence...
Abstract In quantum materials, the electronic interaction and electron-phonon coupling are, in general, two essential ingredients, combined impact of which may drive exotic phases. Recently, an anomalously strong electron-electron attraction, likely mediated by phonons, has been proposed one-dimensional copper-oxide chain Ba 2− x Sr CuO 3+ δ . Yet, it is unclear how this near-neighbor attraction V influences superconductivity pairing system. Here we perform accurate many-body calculations to...
Electron-hole bound pairs, or excitons, are common excitations in semiconductors. They can spontaneously form and condense into a new insulating ground state---the so-called excitonic insulator---when the energy of electron-hole Coulomb attraction exceeds band gap. In presence electron-phonon coupling, periodic lattice distortion often concomitantly occurs. However, similar structural transition also be induced by coupling itself, therefore hindering clean identification bulk insulators...